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Question

Which of the following pairs of parts can be considered as the higher pairs?

1. Pair of gear in mesh

2. Belt and pulle

3. Cam and follower

निम्नलिखित भागों के युग्मों में से कौन से युग्म उच्चतर युग्म माने जा सकते हैं?

1. Pair of gear in mesh

2. Belt and pulle

3. Cam and follower

A.

1 and 2

B.

2 and 3

C.

1,  and 3

D.

1 , 2 and 3

Answer ( Option D)

1 , 2 and 3

Solution

Kinematic pairs are classified under three headings namely, lower pair, higher pair, and wrapping pair.
Lower Pair:
  • A pair is said to be a lower pair when the connection between two elements is through the area of contact. 
Some of the types of Lower pair are:
  • Revolute Pair
  • Prismatic Pair
  • Screw Pair
  • Cylindrical Pair
  • Spherical Pair
  • Planar Pair
Higher Pair:
  • A pair is said to be higher pair when the connection between two elements has only a point or line of contact.
Examples of higher pairs are:
  • A point contact takes place when spheres rest on a plane or curved surface (in the case of ball bearings)
  • Contact between teeth of a skew-helical gears
  • Contact made by roller bearings
  • Contact between teeth of most of the gears
  • Contact between cam-follower
  • Contact between belt and pulley.
Wrapping Pairs:
  • In a higher pair, the contact between the two bodies has only a line contact or a point contact. Whereas in a wrapping pair, one body completely wraps over the other.
  • The typical example is of a belt and a pulley or a chain and a sprocket where the belt completely wraps around the pulley or the chain completely wraps around the sprocket. 

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